This question is all over property management and real estate groups on Fb.....and my response is that it can be done.
First, the seller or their professional property manager should have photos of the property VACANT. I take my NEXT marketing photos right before the CURRENT residents move in...good camera, flash, blinds open...at least 2 per room so I can market for next renters or provide if owner wants to sell.
Prospects' agent needs to have qualification/lender's letter to provide to listing agent and request 2 times for their clients to view. Seller's agent or property manager should provide those 2 times to tenants, ask when would be most convenient time for them to vacate home for 15 minutes and whoever accompanies the prospects should leave a $50 Amazon gift card on the kitchen counter for the residents.
Forget what the lease says. Make it worth the tenants' while to leave their home, go to a park, walk the dog, go to the grocery store...It can be done!